<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
    </head>
    <body>
        <div id="app">
            {{msg}}
            <input type="number" v-model.trim="val" />{{val}}
            <!-- <input type="text" v-model.number="val" />{{val}} -->
            <!-- <input type="text" v-model.lazy="val" />{{val}} -->
        </div>
        <script src="../vue.js"></script>
        <script>
            let vm = new Vue({
                // el: '#app',
                data: {
                    msg: 'hello',
                    val: '',
                },
            }).$mount('#app'); // 手动挂载
        </script>
    </body>
</html>
